<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Set集合</title>
</head>
<script>
    let s = new Set()
    let s2 = new Set(['大事儿','小事儿','好事儿','什么事儿'])
    s2.add('其他事儿')
    s2.delete('小事儿')
    s2.clear()
    console.log(s2)
</script>
</html>